-er b-u bbb bbc bbd bbe bbk bbm bbr bbu bcb bcc bcd bce bck bcm bcr bcu bdb bdc bdd bde bdk bdm bdr bdu be- beb bec bed bee bek bem ber beu bkb bkc bke bkk bkm bkr bmb bmc bmd bme bmk bmm bmr bmu brb brd bre brk brm brr bru bub buc bud bue buk bum bur buu c-- cbb cbc cbd cbe cbk cbm cbr cbu ccb ccc ccd cce cck ccm ccr ccu cdb cdc cdd cde cdk cdm cdr cdu ce- ceb cec ced cee cek cem cer ceu ckb ckc ckd ckm cmb cmc cmd cme cmk cmm cmr cmu crb crc crd cre crk crm crr cru cub cuc cud cue cuk cum cur cuu dbb dbc dbd dbe dbk dbm dbr dbu dcb dcc dcd dce dck dcm dcr dcu ddb ddc ddd dde ddk ddm ddr ddu de- deb dec ded dee dek dem der deu dkb dkc dke dkk dkm dkr dku dmb dmc dmd dme dmk dmm dmr dmu drb drc drd dre drk drm drr dru dub duc dud due duk dum dur ebb ebc ebd ebe ebk ebm ebr ebu ec- ecb ecc ecd ece eck ecm ecr ecu ed- edb edc edd ede edk edm edr edu eeb eec eed eee eek eem eer ekb ekc ekd eke ekr eku em- emb emc emd eme emk emm emr emu erb erc erd ere erk erm err eru eu- eub euc eud eue eur kbb kbc kbd kbe kbk kbm kbr kbu kcb kcc kcd kce kck kcm kcr kcu kdb kdc kde kdk kdm kdr kdu ke- keb kec ked kee kek kem ker kkb kkc kke kkk kkm kkr kku kmb kmc kmd kme kmk kmm kmu krc krd krk krr kru kub kuc kud kue kuk kum kur kuu m-r mbb mbc mbd mbe mbk mbm mbr mbu mc- mcb mcc mcd mce mck mcm mcr mcu mdb mdc mdd mde mdk mdm mdr mdu meb mec med mee mek mem mer meu mkb mkc mkd mke mkk mkm mkr mku mmb mmc mmd mme mmk mmm mmr mmu mrb mrc mrd mre mrk mrm mrr mru mub muc mud mue muk mum mur muu rbb rbc rbd rbe rbk rbm rbr rbu rcb rcc rcd rce rcm rcr rcu rdb rdc rdd rde rdm rdr rdu re- reb rec red ree rek rem rer reu rkb rkc rke rkk rkm rku rmb rmc rmd rme rmm rmr rrb rrc rrd rrk rrm rrr rru rub ruc rud rue ruk rum rur ruu ubb ubc ube ubk ubr ubu ucb ucc ucd uce uck ucm ucr ucu udb udc udd ude udk udm udr udu ueb uec ued uee uem uer ukb ukc uke ukk ukr uku um- umb umc umd ume umm umr umu ur- urb urc urd ure urk urm urr uru uuc uue uum uur uuu